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The recommended way to build .deb packages targeting Debian or Rasbian is to compile the package on the machine or inside an emulated machine. Thus the recommended way to cross-compile a .deb for Raspberry Pi is to emulate a complete system using qemu on a X86 machine and use it to do the compiles.
http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/